还在对着GMAT语法难题不知如何是好?北京新东方GMAT教师在此为大家带来详细的题目解析。
(GWD-TN-1-41) Leaching, the recovery of copper from the drainage water of mines, as a method of the extraction of minerals, it was well established as early as the eighteenth century, but until about 25 years ago miners did not realize that bacteria take an active part in the process.
A.as a method of the extraction of minerals, it was well established
B.as a method of the extraction of minerals well established
C.was a well-established method of mineral extraction
D.was a well-established method of extracting mineral that was
E.had been a method of mineral extraction, well established
本题的翻译是：过滤，即从污水中提炼铜的方法，早在18世纪就是一种矿物开采所采用的有效方法，但直到约25年前，矿工们还没有认识到细菌在这一过程中所发挥的积极作用。
句式：
Leaching, the recovery ... , was a well-established method..., but ... miners did not realize that...
思路：
看到代词是否有所指代，然后was的位置，出现了but看什么和什么并列。
选项：
A.两个主语：it和leaching;
B.主句缺少谓语动词;
C.正确;
D.that was应该修饰leaching，但是这里就近修饰矿物开采;
E.过去完成时使用错误;well established不知道是修饰矿物还是修饰过滤。
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